Final answer:
Disposable diapers are generally more effective than cloth diapers at keeping a baby dry, due to their absorbent materials. During birth, the fetus is pushed out by uterine contractions. The umbilical cord is cut because the baby's breathing takes over its functions.
Step-by-step explanation:
When comparing the effectiveness of cloth diapers and disposable diapers in keeping a baby dry, disposable diapers are generally more effective. Disposable diapers are designed with highly absorbent materials that lock away moisture, such as sodium polyacrylate, which turns liquid into gel. On the other hand, cloth diapers are made with natural fibers that can absorb some moisture but may not be as effective at preventing leaks or keeping moisture away from the baby's skin without frequent changes.
Review Questions:
- The fetus is pushed out of the uterus during birth due to contractions of the uterine muscles. These contractions are part of the body's natural process to deliver the baby. They become increasingly intense and frequent as labor progresses, helping to push the baby through the birth canal.
- The umbilical cord is cut before a newborn has started to breathe on its own because, immediately after birth, the baby no longer needs to rely on the placenta for oxygen and nutrients. Once the baby begins to breathe air, the lungs take over, and the blood circulation changes, making the umbilical cord unnecessary. Clamping and cutting the cord is done to prevent blood loss and minimize the risk of infection.